i am replacing my patio and i have taken up the old slabs, the ground under them is quite firm and i will be ok to lay new slabs there but the ground over the whole area although firm is not level it undulates....only slightly but it does, firstly do you think its necessary for it to be level, the old slabs were there and they were ok just a bit naff and old fashioned, if i do need to level it can anyone suggest the best way to do it please, never done this before and not sure where to start
thanks
Bill
thanks
Bill